Coil winding

ABSTRACT

A cone-shaped magnetic core structure for receiving toroidal beam deflection coils for use with cathode ray tubes. The magnetic core structure has attached to the respective front and rear ends thereof relatively large and small diameter grooved insulating structures. The grooves in the insulating structure are mutually arranged so that in one pair of opposite quadrants looking along the central axis of the core grooves of the rear insulating structure are aligned with even-numbered grooves in the front insulating structure. In the other pair of opposite quadrants the grooves of the rear insulating structure are aligned with odd-numbered grooves of the front insulating structure.

United States Patent 3 Phillips Apr. 2, 1974 [54] COIL WINDING 3,758,888 9/l973 Kadota 335/210 [75] lnventor: Peter Harold Phillips, Fareham,

England Primary Examiner-George Harris Attorney, Agent, or Firm-Scrivener Parker Scrivener {73] Asslgnee: Plessey Handel Und Investments & Clarke A.G., Guz, Switzerland {22] Filed; Jan. 26, 1973 57 ABSTRACT pp NOJ 323,010 A cone-shaped magnetic core structure for receiving toroidal beam deflection coils for use with cathode ray [30] Foreign Application Priority Data tubes. The magnetic core structure has attached to the Jan 13 1972 Great Britain. 1564/72 respective front and rear ends thereof relatively large and small diameter grooved insulating structures. The [52] U S Cl 335/210 335/213 grooves in the insulating structure are mutually ar- [51] i 7/00 ranged so that in one pair of opposite quadrants look- [58] Fie'ld 313/76 ing along the central axis of the core grooves of the g I rear insulating structure are aligned with evennumbered grooves in the front insulating structure. In 5 References Cited the other pair of opposite quadrants the grooves of the UMTED STATES PATENTS rear insulating structure are aligned with odd- 3,601,73l 8/1971 Christiana 335/210 numb red grooves of the from insulating structure. 3,634,796 1/1972 Nakano 335/210 3,7l L802 1/1973 Torsch 335/210 2 Claims, 3 Drawing Figures PATENTEDAPR 21974 3.801; 941 .SHEEI 2 0F 2 288 2 3 ARc 0F WINDING I/ FUR VERTICAL ARC 0F WINDING COIL 0. FUR HORIZONTAL COIL A ARC 0F WINDING FOR HORIZON TA L ARC OF WINDING COIL 8 FOR VERTICAL COIL COIL WINDING The present invention relates to the winding of electric coils and is specifically concerned with the winding of toroidal beam deflection coils for use with cathode By this arrangement of the grooves the two vertical and two horizontal coils can be wound simultaneously without significant loss of symmetry about the core axis.

ray tubes. 5 For a better understanding of the present invention In order to facilitate the winding of turns of wire on reference will now be made to the accompanying drawto a generally cone-shaped magnetic core so as to afings in which: ford a pair of diametrically opposite horizontal deflec- FIG. I shows a cross-sectional view taken through tion coils and a pair of diametrically opposite vertical the central axis of a conventional magnetic core strucdeflection coils, it is known to fit relatively large and ture for beam deflection coils, small grooved insulating ring structures to the front and FIG. 2 is a diagram that illustrates the arrangement rear ends of the core, respectively with the front ring of coil turns in the grooves or slots of the moulded insuhaving twice as many grooves as the rear ring for relating structure of FIG. 1: and, ceiving the turns of wire. Accordingly, when all of the FIG. 3 is-a diagram similar to FIG. 2 but which shows equispaced grooves of the front ring structure are occuhow the spacing of grooves in the rear insulating strucpied by turns of wire to form a single layer such turns ture is modified to facilitate the simultaneous winding of wire will be arranged in two layers at the rear end of Of all the deflection Co the core, the turns of the first layer occupying the equi- Referring to 0f the drawings, a generally Conespaced grooves of the rear ring structure and the turns Shaped magnetic -gferrite) core E has moulded of the second layer occupying the troughs between adlating rings F and G fitted to what may be regarded as jacent turns of the first layer. In this construction the the front and rear ends of the core E. Both of the rings grooves in the rear insulating structure are aligned with F and G have grooves or slots H and I moulded therein respect to alternate grooves in the front insulating for receiving the turns of beam deflection coils. These structure and the four coils are balanced symmetrically coi s compr se two ertical deflection coils which are about the central axis of the core. wound on the core E at diametrically opposite positions However, the construction just above referred to and two horizontal deflection coils also arranged diadoes not permit of the four coils being wound on the metrically opposite to one another as will be better apcore simultaneously thereby affording a significant savpreciate from FIG. 2- A single turn of one of the vertiing in manufacturing costs, since insurmountable diffi- Cal de ec ion coils s indicated at J in FIG. 1. culties arise in connection with the requisite symmetry u g HOW t I 2 i h hOWS fragmentarily of the coils about'the core axis as will hereinafter be aphow the turne of wire forming the coils are located in parent. the grooves or slots of the insulating rings F and G, the With a view to overcoming these difficulties there is horizontal coils are designated coils A and B and the provided a magnetic core structure as aforesaid having vertical coils designated coils C and D. These coils exgrooved front and rear insulating structures of relat nd ver he respective arcs indicated approximately tively large and small diameters, in which the grooves in the Figure. The insulating ring F has 288 grooves or in the insulating structure are mutually arranged so that slots equally spaced therearound, (only a few of the in one pair of opposite quadrants looking along the slots are shown in the figure) whereas the smaller insucentral axis of the core grooves of the rear insulating lating ring G has 144 grooves or slots equally spaced structure are aligned with even-numbered grooves in 40 therearound and it is arranged that the grooves in the the front insulating structure and in the other pair of ring G are radially aligned with alternate grooves or opposite quandrants the grooves of the rear insulating slots in the larger ring F as shown in the Figure. First structure are aligned with odd numbered grooves of layer coil turns on the ring G may be wound in the oddthe front insulating structure. This arrangement acnumbered grooves or slots of the ring F whereas second cording to the present invention is preferably achieved layer turns on the ring G may be wound in evenby modifying the spacing between the grooves in the numbered grooves or slots of the ring F. rear insulating structure close to the boundaries be- One possible winding distribution arrangement is intween quadrants. dicated in the following table I.

, ""NFIYABLVE I a Slot Nos. in ring 2 Horizontal coil A:

1stlaye1'turns 11, 13, 15, 17, 19, 21, 23, 27, 31, 33, 35, 37, 2d layer turns. 34, 1st layer turns-- 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 2d layer turns- 46, 48, 50, 52, 56, 1st layer turns" 59, 61, 63, 65, 67, 69, 71, 73, 75, 2d layer turns. 58, 68, 70, 72, 74, 76, 1st layer turns.. 77, 70, s1, s3, 85, 87, s9, 91, 9a, 95, 2d layer turns... 78, 88, 90, 94, 96, 1st layer turns" 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 2d layer turns 98, 100, 112, 1st layer turns.. 119, 123, 125, 127, 129, 131, 133, 135, Vertical coil 0: 1st layer turns.

2d layer turns.-. s0, s2, s4, 86, 92, 102, 104, 10s, 108, 110, 114, 1st layer turns 117, 121, 2d layer turns.-. 116, 118, 120, 122, 124, 125, 123, 130, 132, 134, 1st layer turns 137, 139, 141, 143, 145, 147, 2d layer turns 130, 138, 140, 142, 144, 145,

7 Table .1 -Continued Slot Nos. in ring 2 1st layer turns. 149, 151, 153, 2d layer turns..- 148, 150, 152, 154, 156, 158, 160, 162, 164,

1st layer turns. 169, 173, 2d layer turns... 166, 168, 170, 172, 174, 176, 180, 182, 184, 186, 188,

1st layer turns. 2d layer turns..- 198, 204, 206, 208, 210.

N MEL-Coils B and D can be distributed identically as A and C respectively but 180 removed from A and C.

In order to achieve symmetry of the coils the turns 10 71, but out of position equivalent to half the angle beof that part of coil A in quadrant 2 must be placed, in odd-numbered slots or grooves in the ring F to provide a mirror image of that part of horizontal coil A in quadrant 1. If the coils A, B, C and D are wound simultaneously these grooves or slots will already have been filled by turns of vertical coil C which must be wound first in grooves aligned with grooves on the internal bore.

Turning now to P16. 3 this shows'fragmentarily how the spacing between the grooves or slots of smaller insulating ring G is modified from the known arrangetween slot 71 and 72 on the inner diameter. This small error in positioning one turn is considered to be acceptable but it is possible to further modify the small diameter ring moulding so that the groove for the turn wound in external slot 73 is moved through a small angle in order to compensate. A further modification of this would be to move through an even smaller angle the groove or slot for turns wound in the slots 73 and 75. One possible winding distribution for the arrangement described according to the invention is shown in Table 11.

TABLE ll Slot Nos.

Horizontal coil A:

1st layer turns.. 12, 14, 16, 18, 22, 26, 30, 32, 34, 36, 38, 40, 2d layer turns. I 35,

1st layer turns... 42, 44, 46, 48, 50, 52, 54, 56, 58, 2d layer turns. 45, 47, 51, 55, 57,

1st layer turns.-. 60, 62, 64, 66, 68, 70, 73, 75, 2d layer turns. 61, 67, 69, 71, 76, 77,

1st layer turns.. 79, 85, 89, 91, 95, 2d layer turns. 78, 80, 82, 84, 86, 88, 90, I 92, 9-1, 96,

1st layer turns.. 99, 101, 111, 2d layer turns- 98, 100, 102, 104, 106, 108, 110, 112, 114,

1st layer turns... 2d layer turns- 116, 120, 124, 126, 128, 130, 132, 134,

Vertical coil 0:

1st layer turns.. 81, 83, 87, 93, 97, 103, 105, 107, 109, 113, 2d layer turns.

1st layer turns... 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 2d layer turns- 118, 122,

1st layer turns.. 135, 137, 139, 141, 143, 146, 2nd layer turns. 136, 138, 140, 142, 144, 147,

1st layer turns.. 148, 150, 152, 154, 2d layer turns. 149, 151, 153, 155, 157, 159 161, 163,

1st layer turns. 168, 172, 2d layer turns. 165, 167, 169, 171, 173, 175, 177, 181, 183, 185,

1st layer turns.. 2d layer turns. 187, 193, 197, 203, 207, 209,

N 0TE.C0ils B and D can be distributed identically as A and C respectively but 180 removed from A and C.

ment of FIG. 2 in orderto enable all of the four beam What we claim is:

It can be seen that a second layer turn placed in slot 77 in the quadrant 2 will be at the same angle below the horizontal axis as a first layer turn placed in slot 70 in quadrant 1.

11 will be seen however from FIG. 3 that the turn wound in slot 71 in the quadrant 1 which should match the turn wound in slot 75 in the quadrant 2 will move out of position at the small diameter end. This occurs because the position of the turn will be controlled by turns wound in slots and 73 in the first layer. Thus this turn will fall correctly at the outer diameter in slot 1. A magnetic core structure of generally truncated. core shape for receiving toroidal beam deflection coils of cathode-ray tubes, said magnetic structure having attached to it grooved front and rear insulating structures of relatively large and small diameters for receiving the turns of said coils, in which the grooves in the insulating structure are mutually arranged sothat in one pair of opposite quadrants looking along the con trol axis of the core grooves of the rear insulating structure are aligned with even-numbered grooves in the front insulating structure and in the other pair of opposite quadrants grooves of the rear insulating structure are aligned with odd-numbered grooves of the front insulating structure.

2. A magnetic core structure as claimed in claim 1, in which the alignment between grooves in the rear and front insulating structures is achieved by modifying the spacing between the grooves in the rear insulating structure close to the boundaries between quadrants. 

1. A magnetic core structure of generally truncated-core shape for receiving toroidal beam deflection coils of cathode-ray tubes, said magnetic structure having attached to it grooved front and rear insulating structures of relatively large and small diameters for receiving the turns of said coils, in which the grooves in the insulating structure are mutually arranged so that in one pair of opposite quadrants looking along the control axis of the core grooves of the rear insulating structure are aligned with even-numbered grooves in the front insulating structure and in the other pair of opposite quadrants grooves of the rear insulating structure are aligned with odd-numbered grooves of the front insulating structure.
 2. A magnetic core structure as claimed in claim 1, in which the alignment between grooves in the rear and front insulating structures is achieved by modifying the spacing between the grooves in the rear insulating structure close to the boundaries between quadrants. 